Abstract: In this paper, we studied farmland soil wind erosion and its impact factors in Beijing city under conservation tillage in use of Movable Erosion Wind Tunnel. The results show that (1) the volume of soil wind erosion in rotary exposed farmland shows the highest spin in Six plots, cover crops planted in winter can significantly reduce the volume of soil erosion; In different no-tillage methods and straw treatment, the amount of wind erosion depends on seeding-machine.and the volume of Deere comes up to minimum, agricultural haha maximum; Volume of soil erosion in rotary reach the highest spin in four farming methods, plough tillage less 80.81% than rotary,and harrow tillage less 97.71%,no tillage less 95.35%; With the delay of sowing dates, the amount of soil erosion in winter wheat increases . (2) The coverage of wheat field attain to the highest, followed by alfalfa and triticale, and rape the minimum coverage; In four tillage fields of wheat,harrow-tillage coverage comes up to the highest 84.00%, and rotary to the lowest 55.33%;Wheat field coverage planted on September 27 was significantly higher than other sowing date, October 7 and October 12 the lowest. (3) Take the volume of soil erosion as dependent variable,and coverage, crop height and soil bulk density as independent variables for multiple regression analysis, then set up multiple regression equation: Y=173.186-0.449x1-0.485x2- 72.699x3.